When asked to explain ________ he does to make his students so fascinated with his lessons, the teacher paused and thought deeply.

A．what it is that

B．that what it is

C．what is it that

D．that what is that

肝叶切除患者的术后护理错误的是

A．应专人护理
B．常规吸氧
C．鼓励早期下床活动
D．观察腹腔引流液的量和性质
E．术后取半卧位